Create README.md

Author: nicogis

README.md

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+# RemoveClassExtension
+Remove class extension and Instance class
+
+# Description
+
+This is an Add-in for ArcCatalog. In categories 'Remove class extension' you have two buttons. 
+
+If you have a feature class that has a class extension associated or a feature class that is a custom object whose behavior class
+you can use this add-in that remove the reference and set null.
+
+When previewing a feature class or adding it to a map, one of the following error messages occurs: 
+“Error opening feature class. 
+Unable to create object class extension COM component.” 
+“Error opening feature class. 
+Unable to create object class COM component.” 
+
+In the first case, the feature class has a class extension associated that is not installed on the client machine. 
+Using remove class extension you resolve this problem. 
+
+In the second case, the feature class is a custom object whose behavior class is not installed on the client machine. 
+Using remove instance class you resolve this problem.
+
+This add-in runs also for annotation and dimension with class extension or custom object
+
+# Requirements 
+ArcGIS 10.4 Desktop or superior